Take-up for sewing-machines.



W. H. TERWlLL-IGER.

T AKE-UP FOR SEWING MACHINES. APPLICATION FILED MAY 29, 19 115.

1,26%1 1 Patented May 21,1918.

2 SHEETS-SHEET l.

WITNESSES MENTOR TAKE-UP FOR SEWING MACHINES.

APPLICATION FILED MAY 29. ms.

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o M l u. m m T H M n M M y m d A ITORIVEYS the spindle WILLIAM H. TERWILLIGER,

OF AMSTERDAM, NEW YORK, ASSIGNOR T0 FREDERICK KLEIN, TRUSTEE.

TAKE-U1 FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed May 29, 1915. Serial No. 31,144.

To all whom it may concern:

Be it known that I, WILLIAM H. TERWIL- LIGER, a citizen of the United States, and resident of Amsterdam, county of Montgomery, and State of New York, have invented certain new and useful Improvements in Take-Ups for Sewing-Machines, of which the following is a specification.

My invention relates more particularly to lock stitch sewing machines wherein a large loop of thread is required to be drawn back and forth through the goods being sewed. A machine of this type is represented in the patent to G. H. Wilkes, No. 1,049,430, J anuary 7, 1913, for glove sewing machine. In this type of machine the material to be sewed is preferably supported on the end of a tubular spindle and a thread hook reciprocates therein adapted to catch the needle thread loop and draw it down to a position below where it may be grasped and turned over the shuttle in the usual or any preferred manner.

It will be understood that this long loop of thread drawn down by the thread hook must be drawn back through the goods, after the loop has passed over the shuttle, in order that the stitch may be drawn tight. In practical operation of the glove sewing machine it is found that about eight inches of thread must thus be controlled or kept under tension and a take-up device having a movement of eight inches becomes very objectionable not only on account of the length of the lever required but because of the inertia and momentum of the parts when reciprocated at the high speed required in commercial sewing machines.

The object of my invention is to obviate these objections and provide machines of the type referred to with a take-up device capable of high speed operation and adapted, with a short stroke to control the required length of thread.

I preferably obtain a multiple effect by having a movable block containing two sheaves or pulleys over which the thread is led, there being a single relatively fixed sheave or pulley operating in conjunction therewith, the arrangement being such as to give about a four to one relation between the movement of the thread and that of the movable sheaves.

It will be understood, however, that the usual eyelet may take the place of the sheaves if desired.

In the accompanying drawings I have shown a preferred form of my device as adapted for a lock stitch glove sewing machine, but obviously this form of take-up device may be adapted for use with other sewing machines operating in a similar manner. Figure 1 represents a side elevation of the sewing machine with parts broken away; Figs. 2 and 3 are end views of the thread hook mechanism, and spindle partially in section showing the needle thread loop in different positions; Fig. l is a side view of the thread take-up and ten sion device separate from the machine; and Fig. 5 is a top view of the thread take-up and tension device separate from the machine showing the portions of the thread extending from one element to another as lying in different vertical planes.

Referring to the drawings 1 represents the table top of the machine which may be suitably supported in any desired manner. Extending above the top is the closed head 2 which is adapted to carry and protect certain of the operating mechanisms of the machine. The machine is driven from a pulley 8 mounted in bearings 4 in the upper head or casing of the machine and thepulley drives a shaft carrying a bevel gear 5 which meshes with a horizontally disposed bevel gear 6 thereby transmitting power to and operating shaft 7 adapted to drive the various cams and eccentrics for reciprocating the various mechanisms. Since these features are well known and may be of any desired form and are not directly associated with the present invention it is not necessary to describe them more particularly.

In the type of machine the article A to be sewed is supported upon the upper end of a tubular spindle 8 and a thread hook 9 is adapted to reciprocate longitudinally of the spindle and catch the loop of the needle thread B after the needle 10 has penetrated the goods and. entered the end of the spindle 8 substantially. as indicated in Figs. 1 and 2 of the drawings.

The thread hook 9 is reciprocated in a slide 11 supported in a downwardly extending bracket 12, the hook being reciprocated by means of a lever arm 13 substantially as indicated in Fig. 1. A shuttle 14 is mount ed for rotary reciprocation in the bracket 12, a reciprocating member 15 being provided for suitably actuating the shuttle in the well known or any preferred manner.

The loop C of the-needle thread is drawn down by the thread hook 9 until it stands in position to be grasped by the shuttle hook l6 and turned over the shuttle and released at the back thereof substantially as indicated in Fig. f the drawings. After the loop of the needle thread is thus thrown over the shuttle it is necessary to draw the loop back through the spindle and through the goods in order that the stitch may be drawn tight. It will be noted that the spindle in this type of machine may be inches or more in height and therefore the amount of thread necessary to form the loop 0 and carry it over the extreme lower end of the shuttle will amount to about eight inches. To keep this amount of thread under proper tension and at the same time draw it back through the goods in forming the lock stitch it is necessary that some suitable take-up mechanism shouldbe employed. Heretofore take-up mechanisms employing a lever or levers have been used but I have found that a single lever to control eight inches of thread required in the loop C would have to be extremely long in order to obtain the necessary sweep. This construction is heavy and when it is remembered that in commercial machines the machine should be capable of making from three to five hundred stitches a minute, the rapid movement of a long heavy lever vibrating over a sweep of eight inches is liable to break the thread and otherwise prevent the machine from doing satisfactory work at high speed. It is for this reason that I have found it desir- V able to employ intermediate devices and shorten the lever and thereby obtain a device adapted to work at high speed. The movements of the needle 10 and lever 17 are synchronous as the lever 17 moves clockwise when the needle 10 is descending and counterclockwise when the needle 10 is ascending, the arm 17 being at the end of its stroke when the needle 10 is at the end of its stroke when the elements are viewed as in I Fig. 1 of the drawing.

The lever 17 is pivoted at 18 on the rear side of the head 2 substantially as indicated in Fig. 1 of the drawings and is adapted to be operated by suitable means controlled by "the shaft 17. Preferably the lever is vibrated by a reciprocating rack.19 meshing with a segment 20 preferably located within able retaining clips 22 are preferably attached to the upper end of the lever to assist in keeping the threadfrom running off the sheaves. A relatively fixed sheave eyelet or runner 23 is mounted upon a bracket 24 suitably secured to the head 2 as indicated in Fig. 1 of the drawings. This sheave is preferably also provided with a retaining clip 25. The bracket 24 is extended above the sheave 23 and has attached thereto a double disk tension device 26 which may be of usual or any preferred construction. A bracket 27 is secured to the side of the head casing 2 and is adapted to support the spool of thread 28 which supplies the thread B to the needle.

A supplemental tension hook or runner 29 is preferably provided at 30, and is adapted to exert at all times a light tension on the thread as it is turned from the horizontal to an approximately vertical line in going to the needle.

From an inspection of the drawings it will be seen that the needle thread is led from the spool 28 through the tension disks 26 then back to one of the sheaves or runners 21 on the lever 17 over this sheave and then to the fixed sheave 23, around the latter and back to the other movable sheave 21 and then to the tension hook 29 from which it is led through the eye of the needle in the usual manner. From this arrangement it will be seen that there are four threads coming to or leaving the movable sheaves 21 and therefore any movement of the lever 17 will be transmitted to the needle thread B and draw it through the needle four times as far as the sheaves 21 are moved. Thus by having a short lever vibrating over a short sweep as indicated by the dotted lines in Fig. 1 it Will be seen that I am enabled to reduce the weight and momentum of the vibrating parts so that the machine may be operated at high speed Without breaking the thread While at the same time providing the necessary tension on the thread to properly form the lock stitch in the seam.

It will be understood that various modifications in the specific details of construction of the mechanism and arrangement of my take-up device may be made without departing from the spirit and scope of the invention, and the use of the word sheave or sheaves in the claim is intended to cover a 7 up slack in the needle thread and sheaves carried by said arm, the thread being carried over said sheaves and tension device to the needle.

In testimony whereof I have hereunto set my hand in the presence of two subscribing 1 witnesses.

WILLIAM H. TERWILLIGER.

Witnesses:

FREDERICK KLEIN, J. E. STEILE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

